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Mopar sells this same coolant in two versions:
mopar 68048953AB - what you have in the photo, is 100% coolant, you need to mix/dilute it yourself
mopar 68163849AB - 50/50 premixed, it says in big bold letters "50/50 PREDILUTED - DO NOT ADD WATER"

If you don't know what's in the car, flush it first. Mixing coolants can be problematic. Who knows what the prior owners or quick-change oil jockeys put into it.

Get a bunch of distilled water (gallon jugs are like $1ea at walmart)--get 8-10 gallons, and find a few videos on how to flush it.

The basic idea is:
  • you drain it with the petcock valve at the bottom of the radiator, then close the valve
  • then take the top hose off the radiator and run it while filling it with just water until it flows out of the hose clear
  • drain it from the petcock again
  • put the top hose back on
  • do your final fill w/coolant and water mixed 50/50 (or whatever ratio your climate needs)
There is a bleeder screw up top right before the top hose--remove that, then run it for a few minutes until it stops bubbling out the bleeder hole while checking the level/topping it off--then tighten that down and you should be good to go

Now, the bad news:
You probably have a leak.
Coolant levels generally should stay very stable--the fact that your coolant level decreased indicates you have a leak somewhere in your system.
Check:
  • all your coolant hoses
  • your radiator
  • your heater core
  • your exhaust for water
  • your oil for water
The last two are worst case scenarios, but better to know than not.
 

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I forgot to mention, you also should check your water pump for leaks.
If there's a drip (or more) of coolant out the bottom of your car (wait till everything is dry, and park over dry pavement and wait and see), that would be because your water pump gasket is leaking and it's coming out the internal weep hole.

That one is harder to tell because in that area you could get leaks of oil, ATF from the power steering pump, or coolant from the water pump weep hole--none of which are good, but a coolant leak there is the easiest of the three problems to fix (just replace the water pump).

If you identify a leak, usually you need to drain the system to repair it--but as long as you use a clean bucket you can reuse the fluid you empty out of it once your repair is done--no need to waste money on fresh coolant again.
 

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I wouldn't risk mixing unknown coolants together.
When coolants aren't compatible they can turn to sludge quickly and block coolant passages--and on these 3.7L motors that's a death sentence.
I'd highly recommend you flush it and put all new coolant in so you know exactly what's in the system.
 
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